MB-3447 - binary protocol err handling
MB-3447 - binary protocol err handling

Need to schedule the upstream conn into libevent so the error response
actually gets written to socket.

Change-Id: Id058e9dc84beeb2b109b99787b1ee9fc35dbbb38
Reviewed-on: http://review.membase.org/4664
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

couchbase/moxi,membase/moxi,zbase/moxi,zbase/moxi,zbase/moxi,zbase/moxi,membase/moxi,couchbase/moxi,membase/moxi,couchbase/moxi,couchbase/moxi,membase/moxi,membase/moxi,zbase/moxi,membase/moxi,couchbase/moxi,couchbase/moxi